Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the switch structure

From	Lukas Wunner <lukas@wunner.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the switch structure
Date	2017-05-21 07:40 +0200
Message-ID	<tJrKV-3Ec-3@gated-at.bofh.it> (permalink)
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On Sun, May 21, 2017 at 05:29:47AM +0000, Levy, Amir (Jer) wrote:
> On Sun, May 21 2017, 07:47 AM, Lukas Wunner wrote:
> > On Thu, May 18, 2017 at 05:39:08PM +0300, Mika Westerberg wrote:
> > > +
> > > +	default:
> > > +		sw->generation = 1;
> > > +		break;
> > 
> > If someone adds an entry for, say, a new TB3 controller to nhi_ids[] but
> > forgets to update this function, the controller is assigned the wrong
> > generation number.  It might be better to make TB3 the default and list
> > each TB1 controller instead since it's less likely for Intel to introduce
> > an older gen chip.
> > 
> > Generally I think it's problematic to require that multiple files are
> > touched whenever a new controller is added.  Isn't the generation number
> > or link speed (10/20/40) stored in some register in PCI config space
> > (VSEC 0x1234) or TB config space?
> 
> How about setting information, that isn't available from PCI, in
> pci_device_id.driver_data when initializing nhi_ids[]?

Right, that would also be possible, though reading the generation number
from a register would be more elegant, if such a register exists.

Thanks,

Lukas

Thread

[PATCH 18/24] thunderbolt: Store Thunderbolt generation in the switch structure Mika Westerberg <mika.westerberg@linux.intel.com> - 2017-05-18 16:50 +0200
  Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure Lukas Wunner <lukas@wunner.de> - 2017-05-21 06:50 +0200
    RE: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure "Levy, Amir (Jer)" <amir.jer.levy@intel.com> - 2017-05-21 07:40 +0200
      Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure Lukas Wunner <lukas@wunner.de> - 2017-05-21 07:40 +0200
        Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure Mika Westerberg <mika.westerberg@linux.intel.com> - 2017-05-21 09:50 +0200
          Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure Mika Westerberg <mika.westerberg@linux.intel.com> - 2017-05-21 10:10 +0200
            RE: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure "Levy, Amir (Jer)" <amir.jer.levy@intel.com> - 2017-05-21 10:10 +0200
              RE: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure "Bernat, Yehezkel" <yehezkel.bernat@intel.com> - 2017-05-21 12:00 +0200
                Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure Mika Westerberg <mika.westerberg@linux.intel.com> - 2017-05-21 12:50 +0200
                RE: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure "Bernat, Yehezkel" <yehezkel.bernat@intel.com> - 2017-05-21 13:20 +0200
                Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure Mika Westerberg <mika.westerberg@linux.intel.com> - 2017-05-21 13:50 +0200
              Re: [PATCH 18/24] thunderbolt: Store Thunderbolt generation in the  switch structure Mika Westerberg <mika.westerberg@linux.intel.com> - 2017-05-21 12:50 +0200

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